Electric rivet heater



Jan# 2, 1923. v

FILED .IULY 6,1921.

OO OOO OO Patented Jan. 2, 1923.

UNITED STATES EDMUND SCHRDER, 0F BERLIN, GERMANY.

ELECTRIC RIVET HEATER.

Application led July 6, 1921.

To all @fullo/a may conci-11221.',

Be it known that I, EDMUND ScHnnnn, engineer, a tizen of the GermanRepublic, and residing at Nos. 48-51 Maybach-Ufer, Berlin7 Germany, haveinvented certain new and usei'ul improvements in Electric Rivet Heaters,oi" which the following is a specification.

Vith rivet heaters operating with electric resistance heating it isknown to cool vthe electrodes hy conducting :i liquid through them. incontradistinction to this the present invention consists in cooling theelectrodes by letting them evaporate the cooling liquid which latter ispoured into a cavity provided in the electrode for the purpose in view.By this means the cooling operation is simplified and the heater is madeportable owing to its independency ot' liquidconducting pipes.

In order to make my invention more clear. I refer to the accompanyingdrawing in which Figure l is a side-view ot' an electric rivet heaterconstructed according to my invention; *igure 2 is a vertical sectionthrough the upper electrode; and Figure 3 is a if'ertical sectionthrough the lower electrede.

a, and o are the two electrodes which are to he cooled by evaporatingthe cooling liquid. The electrode a is hollow like a vessel and isfilled with the liquid c to he evaporated. The lower electrode Z) h astwo spaces or cavities which are separted one from the other b v :ibroad middle web d having an enlarged head j. The spaces or cavities ol'the electrode i5 are in open communication with the atmosphere in orderto allow oi' the steam freely escaping, just as with the electrode a.

The cooling may be increased by providing the electrodes with ribs genlarging the outer electrode surface which in contact with the air.

The cooling liquid is simply poured into the electrodes and issupplemented from time to timeA by another quantity, corresponding tothe consumption.

The electrodes, especially the lower one, may be so large that thecooling space is ca- Serial No. 482,741.

pable of enclosing, for instance, the oil-box of a transformer, coolingthis latter7 too.

Having now described my invention what I desire to secure by a patent otthe United tates is:

n l. An electrode adapted for use in connection with an electric rivetheater and having space which communicates with the atmosphere at thetop of the electrode and is adapted to receive a cooling liquid to beevaporated by the heat ot the electrode.

2. An electrode adapted 'tor use in connue tion with an electric rivetheater and having spaces which communicate with the atmosphere at thetop of the electrode and are adapted to receive a cooling liquid to beevaporated by the heat of the electrode.

3. An electrode adapted ttor use in connection with an electric rivetheater and having two spaces which communicate with the atmosphere atthe top oi the electrode and are adapted to receive a cooling liquid tobe evaporated by the heat of the electrode; and a web separating saidspaces from each other and forming part ot' the electrode and eX-tending upwards from the electrode bottom.

4. An electrode adapted for use in connection with an electric rivetheater and having two spaces which communicate with the atmosphere atthe top of the electrode and are adapted to receive a cooling liquid tobe evaporated by the heat oit the electrode; a web separating saidspaces ifiom each other and forming part of the electrode and eX-tending upwards from the electrode bottom; and an i-inlargei'i head atsaid web Ain electric rivet heater7 coniprising, in combination, atransformer; an upper electrode having a space which communicates withthe atmosphere at the top ot the electrode and is adapted to receive acooling liquid; and a lower electrode having also such a space; saidlower electrode consisting oi a body, a middle portion and an enlargedhead upon this latter, for the purpose set forth. A

In witness whereof l have hereunto set my hand.

EDMUND SCHRODER.

